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Описание

bool imagegif ( resource $image [, string $filename ] )

imagegif() creates the GIF file in filename from the image image . The image argument is the return from the imagecreate() or imagecreatefrom* function.

The image format will be GIF87a unless the image has been made transparent with imagecolortransparent(), in which case the image format will be GIF89a.

Список параметров

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
filename: The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Примеры

Пример #1 Outputting an image using imagegif()


<?php
// Create a new image instance
$im = imagecreatetruecolor(100, 100);

// Make the background white
imagefilledrectangle($im, 0, 0, 99, 99, 0xFFFFFF);

// Draw a text string on the image
imagestring($im, 3, 40, 20, 'GD Library', 0xFFBA00);

// Output the image to browser
header('Content-type: image/gif');

imagegif($im);
imagedestroy($im);
?>

Пример #2 Converting a PNG image to GIF using imagegif()


<?php

// Load the PNG
$png = imagecreatefrompng('./php.png');

// Save the image as a GIF
imagegif($png, './php.gif');

// Free from memory
imagedestroy($png);

// We're done
echo 'Converted PNG image to GIF with success!';
?>

Примечания

Замечание: Since all GIF support was removed from the GD library in version 1.6, this function is not available if you are using that version of the GD library. Support is expected to return in a version subsequent to the rerelease of GIF support in the GD library in mid 2004. For more information, see the » GD Project site.
The following code snippet allows you to write more portable PHP applications by auto-detecting the type of GD support which is available. Replace the sequence header ("Content-type: image/gif"); imagegif ($im); by the more flexible sequence:

<?php // Create a new image instance $im = imagecreatetruecolor(100, 100); // Do some image operations here // Handle output if(function_exists('imagegif')) { // For GIF header('Content-type: image/gif'); imagegif($im); } elseif(function_exists('imagejpeg')) { // For JPEG header('Content-type: image/jpeg'); imagejpeg($im, NULL, 100); } elseif(function_exists('imagepng')) { // For PNG header('Content-type: image/png'); imagepng($im); } elseif(function_exists('imagewbmp')) { // For WBMP header('Content-type: image/vnd.wap.wbmp'); imagewbmp($im); } else { imagedestroy($im); die('No image support in this PHP server'); } // If image support was found for one of these // formats, then free it from memory if($im) { imagedestroy($im); } ?>

Замечание: As of PHP 4.0.2 you can use the function imagetypes() in place of function_exists() for checking the presence of the various supported image formats:

<?php if(imagetypes() & IMG_GIF) { header('Content-type: image/gif'); imagegif($im); } elseif(imagetypes() & IMG_JPG) { /* ... etc. */ } ?>

Смотрите также

imagepng() - Output a PNG image to either the browser or a file
imagewbmp() - Output image to browser or file
imagejpeg() - Output image to browser or file
imagetypes() - Return the image types supported by this PHP build